Heat deflector for incandescent lamps and similar devices



May 22, 1928.

J. F. DONOVAN HEAT DEFLECTOR FOR INCANDESCENT LAMPS AND SIMILAR DEVICES Filed; NOV. 12, 1923 INYENTUH. z/bHzsr T." 17052021222, M% 57 I Patented May 22, 1928.

UNITED STATES PATENT ()FFICE.

JOHN r. DONOVAN, or CLEVELAND, OHIO, ASSIGNIOB. 'ro GENE A CORPORATION OF NEW YORK.

HEAT DEFLEOTOR FOR IN CANDESCEN T LAMPS AND SIMILAR DEVICES.

Application filed November 12, 1923. Serial No.674,224-

I My invention relates to electric incandescent lamps and other sealed electrical devices containing a filament or other conductor which is heated to a high temperature. My invention is particularly applicae ble to the so-called gas-filled electric incandescent lamp disclosed in United States Patent 1,180,159, issued April 18, 1916 to Langmuir.

My invention consists in an improved means for supporting within such devices a body having the function of protecting a portion of the device from heat. An in sulating disc has been used, especially in the higher wattage gas-filled electric incandescent lamps, for the purpose of breaking up the convection currents in the gas which tend to cause the heat to be transferred rapidly to the base end of the lamp. Heretofore it has been the custom to support such disc by means of the leads which are sealed in the "glass stem of the lamp and electrically connected to the base of the lamp. 7 On the other hand, according to my invention, such body or disc is supported on the glass or other arbor which serves as part of the filament support. M invention has the advantage that it furnis es a more secure support which is more convenientof application.

In the drawing,Fig. 1 is an elevation of a gas-filled electric incandescent lamp in which is embodied my invention' Fig. 2 is a top plan view of a disc and support; Fig. 3 is a vertical section of the same; and Fig. 4 is a perspective of the sleeve WhlCh forms part of my invention.

Referring to the drawing and partlcularly Fig. 1. 10 is a bulb of an electric incandescent lamp having a base 11 and a stem 12. In the latter are sealed the leadinga in wires 13 to which are connected the wires 14 which are sealed into the glass stem and connect with the filament 15. 16 is the arbor, usually of glass, and substantially circular in section, which is integrally united to the stem 12 and which has the wire filament supports 17 sealed therein which engage the filament 15. All of these parts are well-known and commonly used 1n lamps of the gas-filled type disclosed in the Langmuir patent hereinbefore referred to.

The disc 18, which is of mica or other material which will withstand heat, is perforated at 19 so that it may be passed over the leadlng-in conductors 14 during the as- RAL ELECTRIC COMPANY;

semblyof the lamp. It is also perforated at the center at which it is united to a sleeve 20 which is preferably of metal or other elastic material which is more or less refractory. A convenient mode of attaching the disc 18to said sleeve is by means of tabs 21 which may be integral with the rest of the sleeve and are producedas by stamping. Two of said tabs 21 engage one face of the disc 18 and the other two engage the other face and thus the disc is firmly clamped between two sets of tabs. The sleeve 20 is polygonal and preferably square in section and open along one edge to allow for expansion. The sald sleeve with the disc attached is slipped over the arbor 16,

which is usually circular in section, and is held in any desired position by the friction of the polygonal sectioned sleeve with the circular sectioned arbor. .The sleeve is preferably quite resilient or springy and mild steel is an especially suitable material. 7

What I claim as new and desire to secure by Letters Patent of the United States, is

1. In an electric incandescent lamp or other electrical device com rising a sealed container having therein a filament or other conductor to be heated, an insulating support therefor substantially circular. in cross-section and leading-in conductors attachedto said filament or other conductor, thecombination of a disc of insulating material positioned to break up heat convection currents and having said leading-in conductors passing therethrough, and a sleeve of resilient material substantially polygonal in cross section, attached to said disc and also fric-tionallyengaging said insulating support to hold said disc in position.

2. In an electric incandescent lamp or.

other electrical device comprising a sealed container having therein a filament or other;

conductor to be heated, an insulating support therefor substantially circular in cross-sec tion and leading-in conductors attache d to said filamentor other conductor, the combination of a disc of insulating material resilient material substantially polygonal in cross section and open alongone e ge, at-

tached to said disc and also frictionally enlament or other tabs and supporting said disc by friction-- ally engaging said insulating support.

4. In an electric incandescent lamp or other electrical device comprising a sealed container having therein a filament or other conductor to be heated, an insulating support therefor substantially circular in crosssection and leading-in conductors attached to said filament or other conductor, the combination of a disc of insulating material positioned to break up heat convection curcross section attached rising a sealedheated, an insulating suprents and having said leading-in conductors passing therethrough, and a sleeve of resilient material substantiallyrectangular in to said disc and also frictionally engaging said insulating sup.- port to hold said disc in position.

5. In an electric incandescent lamp or other electrical device comprising a sealed container having therein a filament or other conductor to be heated, an, insulating support therefor substantially circular in cross section and leading-in conductors attached to said filament or other conductor, the combination of a disc of insulating material positioned to break up heat convection currents and having said leading-in conductors passing therethrough, and a metal sleeve of resilient material substantially rectangular in cross section and open along one edge,- attached to said disc and also frictionally engaging said insulating support to hold said disc in position.

In witness whereof, I have hereunto set my hand this 9th day of November, 1923.-

JOHN F. DONOVAN. 

